AskBgp Class

Represents a BGP which is a set of Triple Patterns.

Inheritance Hierarchy

System.Object
VDS.RDF.Query.Algebra.AskBgp

Namespace: VDS.RDF.Query.Algebra
Assembly: dotNetRDF (in dotNetRDF.dll) Version:

Syntax

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public class AskBgp : IBgp, ISparqlAlgebra, 
	ITerminalOperator

Public Class AskBgp
	Implements IBgp, ISparqlAlgebra, ITerminalOperator

The AskBgp type exposes the following members.

Constructors

	Name	Description
	AskBgp(IEnumerable<ITriplePattern>)	Creates a Streamed BGP containing a set of Triple Patterns.
	AskBgp(ITriplePattern)	Creates a Streamed BGP containing a single Triple Pattern.

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Properties

	Name	Description
	FixedVariables	Gets the enumeration of fixed variables in the algebra i.e. variables that are guaranteed to have a bound value.
	FloatingVariables	Gets the enumeration of floating variables in the algebra i.e. variables that are not guaranteed to have a bound value.
	IsEmpty	Gets whether the BGP is the emtpy BGP.
	PatternCount	Gets the number of Triple Patterns in the BGP.
	TriplePatterns	Gets the Triple Patterns in the BGP.
	Variables	Gets the Variables used in the Algebra.

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Methods

	Name	Description
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Evaluate	Evaluates the BGP against the Evaluation Context.
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ToGraphPattern	Converts the BGP back to a Graph Pattern.
	ToQuery	Converts the Algebra back to a SPARQL Query.
	ToString	Gets the String representation of the Algebra. (Overrides Object.ToString().)

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Remarks

An Ask BGP differs from a BGP in that rather than evaluating each Triple Pattern in turn it evaluates across all Triple Patterns. This is used for ASK queries where we are only concerned with whether a BGP matches and not in the specific solutions.

An Ask BGP can only contain concrete Triple Patterns and/or FILTERs and not any of the other specialised Triple Pattern classes.

Reference

VDS.RDF.Query.Algebra Namespace